Water-rich depth foundation pit basement dewatering well plugging structure and plugging method thereof

The plugging structure comprises an embedded sleeve arranged outside a dewatering well in a sleeving mode, the embedded sleeve is embedded in a bottom plate of a basement, the lower end of the embedded sleeve penetrates through the bottom plate, and the upper end of the embedded sleeve extends into a sinking groove of the bottom plate; the water stop steel plate is buried in the bottom plate, the water stop steel plate is formed in the middle of the pre-buried sleeve, and the water stop steel plate is arranged in a circle in the circumferential direction of the pre-buried sleeve; the water stop strip is embedded between the root of the water stop steel plate and the embedded sleeve; the cover plate is connected with a connecting sleeve, external threads are formed on the outer portion of the connecting sleeve, the connecting sleeve is screwed to the upper end of the embedded sleeve, the cover plate abuts against the supporting flange of the embedded sleeve, and a sealing gasket is arranged between the cover p